Cobalt(II) Single‐Chain Magnet With Strong Anisotropy and Ferromagnetic IntraChain Coupling
Co(II)-based coordination polymer is reported as a new benchmark single-chain magnet (SCM), exhibiting an energy barrier (U<sub>eff</sub>) of 560 K and a blocking temperature (T<sub>B</sub>) of 21.5 K‒both the highest values observed for SCM systems. The magnetic behavior originates from the synergistic balance between strong axial anisotropy (D<sub>Co</sub> = -83 cm<sup>-1</sup>) and moderate ferromagnetic exchange (J<sub>Co-Co</sub> = +17.7 K), promoting long-range spin correlation over thousands of magnetic ions. Detailed analysis of the correlation length and domain-wall energy reveals a wide SCM regime and a 1D-to-3D magnetic crossover at low temperature. Unlike previously reported radical-bridged SCMs, this work demonstrates a clean, intrinsic design strategy for realizing extreme single-chain magnetism, offering new principles for developing robust molecular spin materials.
Authors
- Yongbing Shen (ORCID: https://orcid.org/0000-0002-1277-6071)
- Shin‐ichi Ohkoshi (ORCID: https://orcid.org/0000-0001-9359-5928)
- Mengxing Cui
- Hiroyoshi Ohtsu (ORCID: https://orcid.org/0000-0002-2911-3151)
- Masahiro Yamashita (ORCID: https://orcid.org/0000-0001-5739-7326)
- Olaf Stefańczyk (ORCID: https://orcid.org/0000-0003-0955-5646)
Institutions
- Tokyo Institute of Technology (JP)
- Tongji University (CN)
- Tokyo University of Science (JP)
- Tohoku University (JP)
- Dynamic Systems (United States) (US)
- The University of Tokyo (JP)
Publication Details
- Journal
- Chemistry - A European Journal
- Published
- 2025-11-28
- DOI
- https://doi.org/10.1002/chem.202503057
- Primary Topic
- Magnetism in coordination complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- University of Tokyo
- Centre National de la Recherche Scientifique
- Japan Society for the Promotion of Science